/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.server.master.metrics;

import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.function.Supplier;

import com.google.common.collect.ImmutableSet;

import io.micrometer.core.instrument.Counter;
import io.micrometer.core.instrument.Gauge;
import io.micrometer.core.instrument.Metrics;
import io.micrometer.core.instrument.Timer;
import lombok.experimental.UtilityClass;

@UtilityClass
public class ProcessInstanceMetrics {

  private final Map<String, Counter> processInstanceCounters = new HashMap<>();

  private final Set<String> processInstanceStates = ImmutableSet.of(
      "submit", "timeout", "finish", "failover", "success", "fail", "stop");

  static {
    for (final String state : processInstanceStates) {
      processInstanceCounters.put(
          state,
          Counter.builder("ds.workflow.instance.count")
              .tag("state", state)
              .description(String.format("Process instance %s total count", state))
              .register(Metrics.globalRegistry)
      );
    }

  }

  private final Timer commandQueryTimer =
      Timer.builder("ds.workflow.command.query.duration")
          .description("Command query duration")
          .register(Metrics.globalRegistry);

  private final Timer processInstanceGenerateTimer =
      Timer.builder("ds.workflow.instance.generate.duration")
          .description("Process instance generated duration")
          .register(Metrics.globalRegistry);

  public void recordCommandQueryTime(long milliseconds) {
    commandQueryTimer.record(milliseconds, TimeUnit.MILLISECONDS);
  }

  public void recordProcessInstanceGenerateTime(long milliseconds) {
    processInstanceGenerateTimer.record(milliseconds, TimeUnit.MILLISECONDS);
  }

  public synchronized void registerProcessInstanceRunningGauge(Supplier<Number> function) {
    Gauge.builder("ds.workflow.instance.running", function)
        .description("The current running process instance count")
        .register(Metrics.globalRegistry);
  }

  public synchronized void registerProcessInstanceResubmitGauge(Supplier<Number> function) {
    Gauge.builder("ds.workflow.instance.resubmit", function)
        .description("The current process instance need to resubmit count")
        .register(Metrics.globalRegistry);
  }

  public void incProcessInstanceByState(final String state) {
    processInstanceCounters.get(state).increment();
  }

}
